![]() It can take up to 20 minutes to regain that night vision. Look at a blue/yellow/green light and your night vision is gone. If you look at a red light at night and then into darkness, you can still see. There's a reason why cockpits are usually lit with red light: The eye isn't blinded by red light and therefore it preserves night vision. Night vision is a very direct indication of whether a light is disruptive or not. Red bonus: Night vision! This is not important by itself of course, but it is helpful nonetheless. ![]() Red light is least disruptive because it has the lowest wavelength. Have you noticed that blue status LED's are annoyingly bright to look at? That's it precisely. The melatonin signal forms part of the system that regulates the sleep–wake cycle by chemically causing drowsiness and lowering the body temperature ( Wikipedia)īlue light is most disruptive because of its wavelength but also because the cells in the eye's retina react to it and the brain believes it's daylight – not good for sleep ( google melatonin for details). (The body's ability to produce this degrades over time, which is why old people sleep much less than young.) One very important aspect of sleep is the absence of light, because light hinders the body's natural ability to produce melatonin which is required for healthy sleep. I use these pure red LEDs myself at home at night, but at the lowest possible intensity. With LED, I only recommend pure red because otherwise you're mixing undesirable colors into the light. The LED stripe you link to has no "pure white" but instead produces its many colors by combinations of red+green+blue. Other colors are in between those two endpoints. Red is good because it is very low-energy in terms of wavelength. I was going to add a comment but I have more to say :-)Īvoid blue because it is very high-energy in terms of wavelength. Mary Jo's answer is spot on – blue paints are good, blue lights are bad, red lights are good. Since you have installed LED lights which are known to emit blue wavelengths, perhaps instead of using them at night, you could use them during the day as a "stimulant." At night, choose dim non-LED, non-fluorescent lighting. In order to improve sleep, they also recommend avoiding looking at bright screens for 2-3 hours before bed and spending as much time in bright light during the day as you can. Harvard recommends using dim red lights for night lights because they are least disruptive to circadian rhythms. Fluorescent tubes are sold with coatings that can shift the color away from blue wavelengths. ![]() ![]() LED lights and those curlicue compact fluorescents emit more blue light waves than old style incandescent bulbs. Light of any kind decreases the secretion of melatonin, a hormone that helps you sleep, and light at night particularly messes with your circadian rhythm (your daily biological schedule which is driven by exposure to light and dark). While blue may be a calming pigment choice for paint, according to Harvard Health, "blue wavelengths-which are beneficial during daylight hours because they boost attention, reaction times, and mood-seem to be the most disruptive at night." ![]()
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